That mutt looks to be a female, although I can't see if it has a nice "V" on the top of the head, the eyeliner is very distinct. You might have made a autosexing by accident... I am just getting into the genetics, so don't shoot me if I am wrong. I think it is related to the wild type that creates those little chipmunks and the crossing with a barred type that makes it autosexing. The more distinct the markings, the more likely female. Again, I am only guessing since I am just starting into the chicken genetics world. I should have paid more attention in my genetics classes in college...
